MPMoviePlayerController not updating cookies that are modified via NSHTTPCookieStorage

I'm developing an iPad application where we have to periodically add/update/delete cookies while MPMoviePlayerController is playing an Adaptive Stream. Everything is working perfectly on the simulator, but when I deploy the application to the device, all cookie modifications are lost. Only the cookies that are set before starting playback were submitted to server and all modifications were ignored. I think this is a bug, but maybe I'm missing something that's why I'm asking here. I really appr开发者_如何学JAVAeciate if anybody could help. Thanks.